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公开(公告)号：US11243376B2
公开(公告)日：2022-02-08
申请号：US16508382
申请日：2019-07-11
Applicant: TDK CORPORATION
Inventor： Akira Suzuki , Shusuke Ichihashi
Abstract: A lens drive device includes a movable unit, a fixed unit, and a support portion. The movable unit includes a magnet and a lens holder for holding a lens. The fixed unit includes a coil board and a base board. The coil board includes a coil facing the magnet and a coil wiring connected thereto. The base board is disposed opposite to the magnet across the coil board and includes a base wiring and an opening through which the optical axis of the lens passes. The support portion relatively movably connects the movable unit to the fixed unit and supports the movable unit to the fixed unit. A first conductive portion conductively connecting the coil wiring and the base wiring in the fixed unit is disposed away from an opening periphery of the opening to an outside in a radial direction.
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公开(公告)号：US10444531B2
公开(公告)日：2019-10-15
申请号：US15799166
申请日：2017-10-31
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
Abstract: A lens drive device includes a movable portion, a fixed portion, and four suspension wires. The movable portion has a lens holder holding a lens and a magnet arranged at a position that does not overlap with the lens when viewed from a light axis direction. The fixed portion has a coil and a position sensor arranged to oppose against the magnet in the light axis direction and a circuit board having multiple wirings. The wires are arranged around the lens at approximately equal intervals in the light axis direction. The sensor and the coil are arranged to overlap with four sides of a four-sided polygon formed by connecting four wire connection positions where the wires are connected with the fixed portion. The sensor is arranged between the wire connection position closest to the sensor and the coil closest thereto.
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公开(公告)号：US11553132B2
公开(公告)日：2023-01-10
申请号：US17126551
申请日：2020-12-18
Applicant: TDK Corporation
Inventor： Yongfu Cai , Hiraku Hirabayashi , Shusuke Ichihashi
Abstract: The position detecting device of the present invention is a device for detecting the position of a movable detection target within a predetermined movable range. The position detecting device comprises: a first magnet (13A) and a second magnet (13B) which are arranged so as to move integrally with the movement of the detection target; a first magnetic detecting circuit (20A) that detects the magnetic field of the first magnet (13A) and a second magnetic detecting circuit (20B) that detects the magnetic field of the second magnet (13B), which are arranged at positions outside the movable range; and a differential amplifier (8) that amplifies the difference between the detection signals of the magnetic field output from the first magnetic detecting circuit (20A) and the second magnetic detecting circuit (20B), and that outputs the amplified difference of the signal as a position detecting signal of the detection target.
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公开(公告)号：US10571647B2
公开(公告)日：2020-02-25
申请号：US15891689
申请日：2018-02-08
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
Abstract: A lens drive device includes a movable portion, a fixed portion, and a nonmagnetic case. The movable portion includes a double-pole magnet having two pairs of magnetic poles, a first coil opposing to the double-pole magnet in a perpendicular direction to a light axis, and a lens holder being movable to the double-pole magnet in a direction of the light axis. The fixed portion includes a second coil arranged so as to oppose to the double-pole magnet in the direction of the light axis. The nonmagnetic case is attached to the fixed portion so as to cover the movable portion. The double-pole magnet includes a first section and a second section. L1/L2 is 1.1 to 2.0, where L1 and L2 are respectively a length of the first and second sections in the direction of the light axis.
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公开(公告)号：US11693212B2
公开(公告)日：2023-07-04
申请号：US16454325
申请日：2019-06-27
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
CPC classification number: G02B13/001 , G02B7/08 , G03B3/10 , H01H47/22 , H04N23/54 , G02B7/02 , H02K41/03 , H04N23/55
Abstract: A lens drive device includes a movable portion, a fixed portion, and a nonmagnetic case. The movable portion includes a double-pole magnet having two pairs of magnetic poles, a first coil opposing to the double-pole magnet in a perpendicular direction to a light axis, and a lens holder being movable to the double-pole magnet in a direction of the light axis. The fixed portion includes a second coil arranged so as to oppose to the double-pole magnet in the direction of the light axis. The nonmagnetic case is attached to the fixed portion so as to cover the movable portion. The double-pole magnet includes a first section and a second section. L1/L2 is 0.9 to 1.1, where L1 and L2 are respectively a length of the first and second sections in the direction of the light axis.
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Patent Agency Ranking
公开(公告)号：US11112577B2
公开(公告)日：2021-09-07
申请号：US16378680
申请日：2019-04-09
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
Abstract: A lens drive device includes a lens holder capable of holding at least one lens and a frame arranged around the holder and holding the holder relatively movable along a light axis of the lens. At least three stopper convex portions protruding toward the frame are formed on an outer circumference of the holder. Stopper concave portions housing each of the stopper convex portions are formed on the frame correspondingly to the stopper convex portions. A convex intersection corner between the first convex end surface and the convex side surface has a chamfering portion or an R curved surface portion to avoid touching a concave intersection corner between the concave bottom surface and the concave side surface.
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公开(公告)号：US10444532B2
公开(公告)日：2019-10-15
申请号：US15965589
申请日：2018-04-27
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
Abstract: The present invention is a lens driving device comprising first driving coils 30a which relatively moves a lens holder 40 against a base part 10 along X axis perpendicular to an optical axis of a lens 100, and second driving coils 30b which relatively moves a lens holder 40 against a base part 10 along Y axis perpendicular to an optical axis. At the base part 10, an opening part 12 is formed where a part of the lens 100 is to be inserted in a movable manner along the driving plane. The oblique diameter Dxy1 and Dxy2 of the opening part 12 along the oblique direction positioned at the middle of X axis and Y axis, is larger than the first inner diameter Dx along X axis direction of the opening part 12, and also larger than the second inner diameter Dy along Y axis direction of the opening part 12. At the base part 10, the cylinder shape projection part 14 is formed along the periphery of the opening part 12.
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公开(公告)号：US20190235205A1
公开(公告)日：2019-08-01
申请号：US16378680
申请日：2019-04-09
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
IPC: G02B7/10
Abstract: A lens drive device includes a lens holder capable of holding at least one lens and a frame arranged around the holder and holding the holder relatively movable along a light axis of the lens. At least three stopper convex portions protruding toward the frame are formed on an outer circumference of the holder. Stopper concave portions housing each of the stopper convex portions are formed on the frame correspondingly to the stopper convex portions. A convex intersection corner between the first convex end surface and the convex side surface has a chamfering portion or an R curved surface portion to avoid touching a concave intersection corner between the concave bottom surface and the concave side surface.
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公开(公告)号：US10302900B2
公开(公告)日：2019-05-28
申请号：US15584403
申请日：2017-05-02
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
Abstract: A lens drive device includes a lens holder capable of holding at least one lens and a frame arranged around the holder and holding the holder relatively movable along a light axis of the lens. At least three stopper convex portions protruding toward the frame are formed on an outer circumference of the holder. Stopper concave portions housing each of the stopper convex portions are formed on the frame correspondingly to the stopper convex portions. A convex intersection corner between the first convex end surface and the convex side surface has a chamfering portion or an R curved surface portion to avoid touching a concave intersection corner between the concave bottom surface and the concave side surface.
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公开(公告)号：US10379321B2
公开(公告)日：2019-08-13
申请号：US15891503
申请日：2018-02-08
Applicant: TDK CORPORATION
Inventor： Shusuke Ichihashi
Abstract: A lens drive device includes a movable portion, a fixed portion, and a nonmagnetic case. The movable portion includes a double-pole magnet having two pairs of magnetic poles, a first coil opposing to the double-pole magnet in a perpendicular direction to a light axis, and a lens holder being movable to the double-pole magnet in a direction of the light axis. The fixed portion includes a second coil arranged so as to oppose to the double-pole magnet in the direction of the light axis. The nonmagnetic case is attached to the fixed portion so as to cover the movable portion. The double-pole magnet includes a first section and a second section. L1/L2 is 0.9 to 1.1, where L1 and L2 are respectively a length of the first and second sections in the direction of the light axis.
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